The wifi network never asked him what device type he was using, it just made an assumption based on something as unreliable as a user agent string. How is it fraud?
On the other hand, if he had simply forgotten to change his UA back to the default (say, after doing some development work), then he couldn't possibly know that he was benefiting from the lower price, and it wouldn't be fraud at that point.
Personally, I have no problem with breaking trivial locks on otherwise non-sensitive networks. The word "fraud" usually conjures up much more serious crime.
* This is very quickly becoming a false assumption I think. Between listening to music from remote servers and watching video on my phone, I think mobile data use, especially in a vacation situation, is fast approaching that of "traditional" data use.